John Gill Commentary Genesis 40:19

"within yet three days shall Pharaoh lift up thy head from off thee, and shall hang thee on a tree; and the birds shall eat thy flesh from off thee." — Genesis 40:19 (ASV)

Yet within three days shall Pharaoh lift up your head from
off you: Order you to be beheaded; so the Targum of Jonathan and Ben Melech interpret it, ``Pharaoh shall remove your head from your body with a sword:''

and shall hang you on a tree; his body after his head was severed from it, this should be hung upon a gallows or gibbet, and there continue:

and the birds shall eat the flesh from off you; as they usually do when bodies are thus hung up, see (2 Samuel 21:9 2 Samuel 21:10); this was signified by the birds eating the bakemeats out of the uppermost basket when upon his head, as it seemed to him in his dream.